薄壁钢管混凝土框架端板连接的抗震性能研究.docVIP

 薄壁钢管混凝土框架端板连接的抗震性能 研究# 王静峰，陈馨怡* 5 10 （合肥工业大学土木与水利工程学院, 合肥 23009） 摘要：本文对 4 个薄壁钢管混凝土柱与钢梁端板连接节点进行了低周反复荷载试验研究，其 中钢管截面为?200×1.5 或?200×3 的冷弯薄壁型钢组合截面，梁柱连接采用单边螺栓和端 板连接。研究了端板类型和柱壁厚度对组合节点的破坏形态、滞回性能和耗能等抗震性能的 影响。同时，结合现有规范，评价了组合节点的延性和刚性。另外，建立了组合节点的有限 元计算模型，并得到试验结果验证。研究表明，带锚固措施的薄壁钢管混凝土框架端板连接 节点具有很好的强度、刚度和延性；当钢管厚度大于 1.5mm 时，为半刚性连接、部分强度节 点；其极限转角均超过美国规范 FEMA-350 规定的延性设计要求，可以安全可靠应用于多层 组合框架结构。 关键词：薄壁；钢管混凝上；端板连接；单边螺栓；抗震性能 15 中图分类号：TU398.1 文献标志码：A Seismic behavior of end plate connections for concrete filled thin-walled steel tubular frames Wang Jingfeng, Chen Xinyi 20 25 30 35 40 (College of Civil Engineering, Hefei University of Technology, HeFei 230009) Abstract: An experimental study on four blind bolted end plate joints to thin-walled CFST columns subjected to cyclic loadings. Cross-section of steel tubular is??200×1.5 or??200×3 combinations of cold-formed steel section. The steel beams and CFST columns are connected by the blind bolts and the end-plates. The effect of type of end plate and thickness of column on the seismic behavior of composite joints was analyzed, such as failure models, hysteretic characteristic and energy consumption. The ductility and rigidity of composite joints were evaluated. Meanwhile, finite element models of composite joints were established, and the mechanism behavior of joint were asserted. It was concluded that when the thickness of steel tubular beyond 1.5mm, this typed joints, which behaves semi-rigid and partial strength, still have reasonable strength, stiffness and ductility by taking reasonable measurements. The ultimate rotations satisfy the design requirements of FEMA-350, and could be reliably and safety used in multi-layer composite frames. Keywords: thin-walled; concrete filled steel tubular; end plate; blind bolt; seismic behavior 0 引言 薄壁钢管混凝土具有承载力高、塑性和韧性好、制作和施工方便、耐火性能好、节约钢 材等特点[1]。目前国内外对薄壁钢管混凝土柱有较多的研究，但是对于薄壁钢管混凝土节点 的研究较少见，缺乏薄壁钢管混凝土节点的设计方法，限制了此类新型组合结构在实际工程 的推广和应用[2-3]。同时，1994 年美国 Northridge 地震和 1995 年日本神户地震的灾后调查已 证实端板连接节点具有良